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(2+1) Resonance Enhanced Ionization Spectroscopy of a State Selected Beam of OH Radicals Margaret E. Greenslade

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FIG. 2. The experimental apparatus consists of a pulsed discharge source togenerate OH radicals, a hexapole field to state select and spatially focus thethe lowest rotational state of OHOH radicals into the laser interaction region, and a time-of-flight �TOF
FIG. 3. Comparison of the vibronic band structure observed by �OHcusing on and off. The2+1�REMPI for the OH 3 2�−�v�=0�−X 2��v�=0� transition with hexapole fo- Q1�1� and S1�1� lines that originate from the selected �J=3/2, f� state are significantly enhanced with hexapole focusing.
FIG. 4. Vibronic spectrum of the newly observed OH D− 2�−�v�=3�X 2��v�=0� transition obtained by �2+1� REMPI with hexapole focusing.Asterisks indicate peaks likely due to unassigned �2+1� REMPI transitionsof H2O.
TABLE I. Spectroscopic constants including band origins ��Tv�, vibrational energies �G�v��, rotational constantsBv�, and spin-rotation constants ��v� derived for vibronic levels of the D 2�− and 3 2�− Rydberg states of OHfrom this and previous experimental studies.
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